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Baklouti Y.,Laboratoire des science des Materiaux et dEnvironnement | Issaoui F.,Route de Soukra km 3.5 | Bekri M.,King Abdulaziz University | Dhahri E.,Route de Soukra km 3.5 | Zouari F.,Laboratoire des science des Materiaux et dEnvironnement
Journal of Superconductivity and Novel Magnetism | Year: 2015

Synthesis, crystal structure, vibrational study and magnetic properties of the compound (C7H18N2) CuCl4 are reported. The latter crystallizes in the monoclinic system (space group P21, Z = 4) with the following unit cell dimensions: a = 7.569(5) Å b = 14.174(5) Å, c = 13.193(2) Å and β = 105.53(3)∘. Besides, its structure was solved using 5754 independent reflections down to R = 0.0475. The atomic arrangement can be described by alternating organic and inorganic layers stacked in the [1̄01] direction, made up of tetrahedral of tetrachlorocuprate CuCl2− 2 sandwiched between two organic layers. In crystal structure, the inorganic layer, built up by independent monomeric [CuCl4]2−, is connected to the organic ones through hydrogen bonding in order to build a three-dimensional network. The magnetic behavior of (C7H18N2) CuCl4 samples was investigated as a function of temperature and applied field. At hightemperature paramagnetic behavior, and at low temperature, evidence for weak ferromagnetism, reinforced by a hysteresis loop at 2 K is observed. The magnetic behavior of (C7H18N2) CuCl4 is attributed to Cu (II) due to the presence of an active Jahn–Teller effect in the d9 electronic system, which give rise to short-range weak ferromagnetism. © 2015, Springer Science+Business Media New York. Source


Ghribi N.,Laboratoire des science des Materiaux et dEnvironnement | Karray R.,Laboratoire des science des Materiaux et dEnvironnement | Laval J.P.,Laboratoire Des Procedes Ceramiques Et Of Traitements Of Surface | Kabadou A.,Laboratoire des science des Materiaux et dEnvironnement | Ben Salah A.,Laboratoire des science des Materiaux et dEnvironnement
Journal of Materials and Environmental Science | Year: 2015

A novel mixed tellurium oxide, Ce0.07Ti0.93Te3O8, has been synthesized and its crystal structure was determined from X-ray powder diffraction data. Rietveld refinement led to final confidence factors Rp=10.3% and Rwp=15.3%. This oxide, which crystallizes in a cubic unit-cell I a 3 as MTe3O8-type framework with cell parameter a=10.985(9) Å, exhibits a structure built up of TeO4E (E= Electronic lone pair of Te(IV) disphnoids and regular Ce/TiO6 octahedra. The crystal structure cohesion is ensured via Te-O(1)-Ce/Ti and Te-O(2)-Te bridges. The Raman spectrum is dominated by a strong band near 470 cm-1 and a weaker one near 650 cm-1 leading to a chemically symmetric Te-O(1)-Ce/Ti bridges. Source


Karray R.,Laboratoire des science des Materiaux et dEnvironnement | van der Lee A.,Montpellier University | Jarraya S.,Ecole preparatoire de lacademie militaire | Ben Salah A.,Laboratoire des science des Materiaux et dEnvironnement | Kabadou A.,Laboratoire des science des Materiaux et dEnvironnement
Arabian Journal of Chemistry | Year: 2014

The crystal structure of lithium-ammonium hexabromotellurate [(NH4)0.63Li0.37]2TeBr6, has been determined by X-ray single crystal analysis at room temperature. The space group is Fm3-m, with a=10.7200(12)Å. Differential scanning calorimetry reveals three anomalies at 195, 395 and 498K. Below 195K the phase transition leads to a tetragonally distorted structure. This low temperature phase shows an anti-ferrorotative displacement of TeBr62- octahedra with a tilt angle 6°. The title compound has an anti-fluorite-type arrangement of NH4+/Li+ and octahedral TeBr62- anions. © 2010. Source


Hentech I.,Laboratoire des science des Materiaux et dEnvironnement | Hentech I.,University Paris Est Creteil | Zehani K.,University Paris Est Creteil | Kabadou A.,Laboratoire des science des Materiaux et dEnvironnement | And 3 more authors.
Journal of Molecular Structure | Year: 2016

Two new iso-structural bimetallic hydrogenselenites [Cu2-xNix(HSeO3)2Cl2.4H2O] (x = 0.62; 0.91) have been synthesized from solution and characterized by single-crystal and powder X-ray diffraction. They crystallized in the orthorhombic Pnma space group with the following lattice parameters: for Cu1.09Ni0.91(HSeO3)2Cl2.4H2O: a = 9.0931 (2) Å, b = 17.7717 (4) Å, c = 7.1620 (2) Å, Z = 4, and for Cu1.38Ni0.62(HSeO3)2Cl2.4H2O: a = 9.0931 (4) Å, b = 17.7467 (7) Å, c = 7.1717 (3) Å; Z = 4. The crystal structure of this compound consists by a three-dimensional framework, but it may be described as a bi-dimensional structure consisting of layers, parallel to the (010) plane formed by two types of (Cu/Ni) octahedral and (HSeO3)- trigonal pyramids. The magnetic measurement, thermal and spectroscopic studies were performed for these compounds. The magnetic results reveal the appearance of a weak ferromagnetic behavior at low temperature (Tc = 16 K for x = 0.91 and 18.8 K for x = 0.62). The DSC analysis enabled us to locate two endothermic peaks. The first peak can be attributed to a completely dehydration of the material, in this transformation, the compounds undergo a structural phase transition which can favor a non-centrosymmetric phase at high temperature confirmed by the thermodiffractograms measurement. The second peak for these samples is due to the ferro-paraelectric phase transition which can be explained by an order- disorder transition. © 2016 Published by Elsevier B.V. Source


Belgaroui H.,Laboratoire des science des Materiaux et dEnvironnement | Loukil M.,Laboratoire des science des Materiaux et dEnvironnement | Karray R.,Laboratoire des science des Materiaux et dEnvironnement | Salah A.B.,Laboratoire des science des Materiaux et dEnvironnement | Kabadou A.,Laboratoire des science des Materiaux et dEnvironnement
Journal of Structural Chemistry | Year: 2010

The crystal structure of rubidium-ammonium hexachlorotellurate [Rb0.94(NH4)0.06]2TeCl6 was determined by X-ray single crystal analysis at room temperature. The space group is Fm3̄m with the lattice parameter a = 10.2503(5) Å and Z = 4. The refinement converged to R(F) = 0.015 and wR(F2) = 0.032. As in the studied [Rb0.94(NH4)0.06]2TeCl6 family, this compound has an antifluorite-type arrangement. Tellurium atoms are surrounded by an octahedron of chlorine atoms. The Rb or N atoms are located between TeCl 6 2- octahedra ensuring the stabilization of the structure by ionic and hydrogen bonding contacts N-H...Cl. The substitution of rubidium by ammonium groups does not affect the structural arrangement, but it leads to a decrease in the a lattice cell dimension. IR and Raman spectroscopic studies at room temperature were performed to confirm the X-ray crystallographic results. © 2010 Pleiades Publishing, Ltd. Source

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